JPH07319813A - System and method for switching cession in on-line system - Google Patents

Abstract

PURPOSE:To reduce work load to be applied on a terminal operator or the like even when some fault in a line system is generated during the period of connection with an objective host. CONSTITUTION:Respective host repeating means 42, 52 execute data repeating processing by opening an initial cession connected to a business program in an objective host computer 5 through a repeating host computer 4 and a line 1-1 from a terminal 3. When a fault on the line 1-1 is detected/recognized by a fault monitoring means 43, 53, respective route reconnecting means 45, 55 select/determine a 2nd route by respective route selecting means 44, 54 and respective route reconnecting means 45, 55 set up a 2nd cession through a line 1-2 based upon the 2nd route information. Respective cession synchronous control means 46, 56 return control to the means 42, 52 after the coincidence of data transmitting/receiving states between both the host computers 4, 5 at the time of generating a fault in the line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an online system, and more particularly to a session switching method and a session switching method in an online system when a line system failure occurs and a route used for business becomes unusable.

[0002]

2. Description of the Related Art Conventionally, when a line system failure occurs for some reason when a terminal is connected to a target host through a relay host computer and an application program (AP) is being operated, an OSI network layer, etc. A fault is detected by the fault detection function implemented in, and a detour is performed by the detour routing function, but the work (AP) currently being processed is disconnected, and data etc. is lost, making it impossible to continue the work. Therefore, the terminal operator had to restart the task from the beginning.

[0003]

In the above-described conventional online system, when a line system failure occurs for some reason, the work interrupted by the failure must be restarted from the beginning. There was a drawback that the work load given to them would be heavy.

[0004]

A first aspect of the present invention relates to an online system for performing business by selecting one of a plurality of lines from a terminal via a relay host computer and connecting to a business program on a target host computer. In the session switching method, both the relay host computer and the target host computer receive a connection request from the terminal and a route definition means for storing the input route definition information in a route information storage table prepared in advance. On the destination host computer from the terminal via the relay host computer and the first line based on the first route information selected from the route information stored in the route information table according to a predetermined criterion. Open an initial session to connect to the business program Host relay section that performs data relay processing on the second session when the second session performs data relay processing on serial initial session is instructed,
After detecting and recognizing a failure on the first line by a predetermined method, failure monitoring means for disconnecting the session on the first path, and after disconnecting processing for the session on the first path. Route selecting means for selecting and determining a second route from the route information in the route information storage table according to the criterion, and the relay host computer and the second from the terminal based on the selected second route information. Path reconnecting means for setting a second session for connecting to the business program on the target host computer via the line, and the relay host computer and the target host when the failure occurs on the first line If the data transmission / reception status prepared in advance in the computer does not match, the transmission / reception of excess or deficiency data is performed by the relay host. And characterized by including a session synchronization control means for instructing the second session to the host relay means after matching the data transmission and reception state is performed between the computer and the target host computer.

A second aspect of the invention is a session switching method in an online system for performing a business by selecting one of a plurality of lines from a terminal via a relay host computer and connecting to a business program on a target host computer. A first route selected by the relay host computer and the destination host computer according to a predetermined criterion from route information stored in a route information table prepared in advance when a connection request is made from the terminal. On the basis of information, an initial session for connecting from the terminal to the business program on the destination host computer via the relay host computer and the first line is opened to perform data relay processing, and the first session is performed during the data relay processing. The failure on the 1st line is decided by a predetermined method. When the second route information is detected and recognized, the session of the first route is disconnected, and the second route information is selected by selecting the second route from the route information in the route information storage table according to the criterion. Based on the terminal from the relay host computer and the second
A second session for connecting to the business program on the target host computer via the line is set up in advance in the relay host computer and the target host computer when the failure occurs in the first line. If the data transmission / reception states do not match, transmission / reception of excess or deficiency data is performed between the relay host computer and the target host computer, and the data transmission / reception states are matched, and then the data The relay processing is restarted.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In this embodiment, as shown in FIG. 1, there is one relay host computer, and the terminal 3, the host computer 4 (relay host computer), the host computer 5 (target host), the line 1-1. , Line 1-2,
... It consists of line 1-n. The terminal 3 is connected to the host computer 4, and the application program (AP) on the host computer 4 includes a path definition means 41, a host relay means 42, a failure monitoring means 43,
A route selection unit 44, a route reconnection unit 45, and a session synchronization control unit 46 are installed. A host computer 5, which is a target host, is connected to the host computer 4 by a plurality of lines (line 1-1, line 1-2, ... Line 1-n), and an application program (AP) on the host computer 5 has , A route definition means 51, which is the same means as the host computer 4, a host relay means 52,
The fault monitoring unit 53, the route selecting unit 54, the route reconnecting unit 55, the session synchronization control unit 56, and a business program used for business are installed.

FIG. 4 is a processing flow when the route defining means 41 and 51 predefine the route through which the terminal 3 is connected to the host computer 5 which is the target host. That is, when the route definition information is input from a maintenance terminal (not shown) (S1), the validity of the input definition information is analyzed such as whether the input terminal name or line name is defined on the network. (S2), and if the analysis result is normal, each piece of information regarding the input route is stored in the route information storage table shown in FIG. 2 (S3).

FIG. 5 is a processing flow chart of the host relay means 42, 52.

After the entry to the route information table is made,
In response to the connection request from the terminal 3, the host relay means 42
Selects one route from the route information stored in the route information table and reads it. (The route selection method at this time is such that the order of selection is determined in advance, such as the order stored in the route information storage table. Next, Fig. 3
As shown in (a), an initial session for establishing a connection from the terminal 3 to the business program on the host computer 5 via the host computer 4, lines 1-1, is established in cooperation with the host relay means 52 (S4). ), Start work (hereinafter, terminal 3-host computer 4-line 1)
-1-Route 1 of the host computer 5 is route 1, Terminal 3-
The route of the host computer 4-line 1-2 host computer 5 is described as route 2). Information and data are repeatedly transmitted and received while performing business (S5). When the job is completed, the host relay unit 42 receives the notification of the job completion from the terminal 3 and disconnects the initial session in cooperation with the host relay unit 52 (S6).

Here, a process of switching the session to the line 1-2 and continuing the work when a failure occurs on the line 1-1 during the work will be described.

FIG. 6 is a diagram showing a processing flow of the fault monitoring means 43, 53. The fault on the line 1-1 is detected and recognized by both the fault monitoring means 43 and the fault monitoring means 53 by the conventional line fault detection method (S7), and the session disconnection process of the route 1 is performed (S8).

FIG. 7 is a diagram showing a processing flow of the route selecting means 44, 54. After the session disconnection process of the route 1 in S8, the route selecting means 44 and the route selecting means 54
Each reads the route information storage table, selects and determines other route information from the defined route information in a predetermined order (S9), and switches to the selected route (S10). In this embodiment, it is assumed that the route 2 is selected.

FIG. 8 is a diagram showing a processing flow of the route reconnecting means 45 and 56. Both the route reconnecting means 45 and the route reconnecting means 56 cooperate with each other to select the selected route 2
Based on this information, session reconnection processing is performed using line 1-2 as shown in FIG. 3B (S11).

FIG. 9 shows session synchronization control means 46, 5.
It is a figure which shows the processing flow of 6. After the session is switched in S11, the session synchronization control means 46 and the session synchronization control means 56 cooperate with each other to confirm the state of the relay processing managed by the AP (application) that is being performed on the line where the failure has occurred. (S12) If the states do not match, the excess and deficiency data are transmitted and received to match the states, and the normalized information before the path switching is delivered to the host relay unit 42 and the host relay unit 52. Resume.

According to the present invention, the operator using the terminal 3 and the business program on the host computer 5 are automatically notified from the faulty route 1 to the route 2 connected by another line without causing the fault to be recognized. The session can be switched to and the work can be continued. In addition, since it can be realized by using the route information table regardless of the line type between the hosts, there is an effect that various backup lines can be used.

[0018]

As described above, according to the present invention, even if a line system failure occurs during connection with the target host, the terminal operator or the business program does not recognize the session disconnection and continues the business. This makes it possible to reduce the work load on the terminal operator.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration example of a route information storage table in the present embodiment.

FIG. 3 is a line 1-1 or a line 1-2 in this embodiment.
FIG. 6 is a diagram showing an example of connection of a session according to FIG.

FIG. 4 is a diagram showing a processing flow of a route defining means in the present embodiment.

FIG. 5 is a diagram showing a processing flow of a host relay unit in the present embodiment.

FIG. 6 is a diagram showing a processing flow of a fault monitoring means in the present embodiment.

FIG. 7 is a diagram showing a processing flow of a route selection unit in the present embodiment.

FIG. 8 is a diagram showing a processing flow of a route reconnection unit in the present embodiment.

FIG. 9 is a diagram showing a processing flow of session synchronization control means in the present embodiment.

[Explanation of symbols]

 1-1, 1-2 ... 1-n line 3 terminal 4 host computer (relay host computer) 5 host computer (target host computer) 41,51 route definition means 42,52 host relay means 43,53 fault monitoring means 44, 54 route selection means 45, 55 route reconnection means 46, 56 session synchronization control means

Claims (2)

[Claims] 1. A session switching method in an online system for performing a business by selecting one of a plurality of lines from a terminal via a relay host computer and connecting to a business program on a target host computer, wherein the relay host computer, Both the target host computer stores the input route definition information in the route information storage table prepared in advance, and the route definition table when the connection request from the terminal is received. An initial session is established for connecting from the terminal to the business program on the destination host computer via the relay host computer and the first line based on the first route information selected from the route information according to a predetermined criterion. And then in the data on the initial session When relay processing is performed and a second session is instructed, a host relay unit that performs data relay processing on the second session and a failure on the first line are detected and recognized by a predetermined method. Failure monitoring means for disconnecting the session on the first path;
Route selection means for selecting and deciding a second route from the route information in the route information storage table according to the standard after session disconnection processing of the first route, and the selected second route information. Route reconnection means for setting a second session for connecting to the business program on the target host computer from the terminal via the relay host computer and the second line, and the fault on the first line. When the data transmission / reception state prepared in advance in the relay host computer and the target host computer at the time of occurrence of the data does not match, transmission / reception of excessive or insufficient data is performed between the relay host computer and the target host computer. After matching the data transmission / reception states, the second session is transmitted to the host relay means. Session switching method in an online system characterized by comprising a session synchronization control means for instructing. 2. A session switching method in an online system for performing a business by selecting one of a plurality of lines from a terminal via a relay host computer and connecting to a business program on a target host computer, the relay host computer and Both of the target host computers are connected to the terminal based on the first route information selected according to a predetermined criterion from the route information stored in the route information table prepared in advance when there is a connection request from the terminal. Data relay processing is performed by opening an initial session for connecting to the business program on the target host computer via the relay host computer and a first line, and during the data relay processing, a connection on the first line is performed. When a fault is detected and recognized by a predetermined method The session is disconnected from the first route, the second route is selected from the route information in the route information storage table according to the criterion, and the terminal is based on the selected second route information. A second session is set up to connect to the business program on the target host computer via the relay host computer and a second line, and the relay host computer and the relay host computer when the failure occurs on the first line When the prepared data transmission / reception states in the target host computer do not match, the excess / deficiency of data is transmitted / received between the relay host computer and the target host computer, and after the data transmission / reception states are matched, On, characterized by restarting the data relay process on session 2 Session switching method in the in-system.